Hi: I updated to 4.8.3 this weekend and now have display rendering issues in windows for KDE applications.
The first issue seems to be a vertical offset issue. All of the KDE windows seem to have their content offset to the top. For example, if I open a web page in Konqueror, the top two inches of the page disappear under the title bar and there is a corresponding gray rectangle at the bottom of the page with no content. I see the same thing in other KDE windows. For example, if I open a Konsole window, the window contents are shifted upwards so the top two lines of text are not visible and there is a gray rectangle at the bottom of the window. Also, if I use the mouse to select a line of text, the highlighted line of text is two lines above where the mouse cursor is located. Similar behavior is seen with buttons. Generally, in order to select a button, I have to place the mouse cursor a half-inch or so below it. The second issue seems to be redraw issue. If I minimize a Konqueror window and then expand it again, it come back with just an empty gray background and no content. If I decrease the size of a Konsole window, the old full-size window remains visible in the background. Another issue is that some KDE windows come up blank when opened (such as the Application Launcher). If I move the mouse around in the blank window, items will appear and disappear as the mouse moves over them and off of them. With this behavior, I cannot change any of the system settings as the window is unusable. I have tried various values for kern.ipc.shmni and kern.ipc.shmseg up to 4096 and it seems to make no difference. Non-KDE applications such as Firefox, Opera, Gimp, Thunderbird, GoogleEarth etc. do not have these problems. They work fine. The video card is an Nvidia FX 2700M (G94GL). I have tried with the native Nvidia driver as well with the NV driver and VESA. The behavior is the same for all This all seems very similar to the behavior that KDEgames had in 4.7.4, but the rest of the KDE windows worked well there. I see occasional errors on the console from which KDE was started such as: QNativeImage: Unable to attach to shared memory segment and kpat(2724)/KSharedDataChache: Unabel to find an appropriate lock to guard the shared cache. This *should* be essentially impossible. :( kpat(2724)/KSharedDataCache: Unable to perform initial setup, this system probably does not really support process-shared pthreads or semaphores, even though it claims otherwise. kpat(2724)/KSharedDataChache: Unable to unmap shared memory segment 0x80e200000 Does anybody have any suggestions to try to fix this? Do I have a configuration issue somewhere? Environment is 8.3 stable AMD64 updated as of 5/26/2012. Ports all up to date as of 5/26/12. X.org X Server 1.10.6 Hardware: Intel T9600 processor with 4GB ram, Nvidia FX 2700M (G94GL) video card. This hardware/Xorg configuration worked fine with 4.7.4 except for KDEgames as mentioned above. Thanks for your help. David B.
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